/*
 *  Licensed to the Apache Software Foundation (ASF) under one or more
 *  contributor license agreements.  See the NOTICE file distributed with
 *  this work for additional information regarding copyright ownership.
 *  The ASF licenses this file to You under the Apache License, Version 2.0
 *  (the "License"); you may not use this file except in compliance with
 *  the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 *  Unless required by applicable law or agreed to in writing, software
 *  distributed under the License is distributed on an "AS IS" BASIS,
 *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *  See the License for the specific language governing permissions and
 *  limitations under the License.
 */

package fr.fonzie.javac;

import static javax.lang.model.SourceVersion.RELEASE_5;
import static javax.lang.model.element.ElementKind.CLASS;

import java.util.Set;

import javax.annotation.processing.AbstractProcessor;
import javax.annotation.processing.ProcessingEnvironment;
import javax.annotation.processing.RoundEnvironment;
import javax.annotation.processing.SupportedAnnotationTypes;
import javax.annotation.processing.SupportedSourceVersion;
import javax.lang.model.element.Element;
import javax.lang.model.element.TypeElement;

import com.sun.tools.javac.tree.JCTree;
import com.sun.tools.javac.tree.TreeTranslator;

@SupportedAnnotationTypes( "javax.persistence.Entity" )
@SupportedSourceVersion( RELEASE_5 )
public class FonzieAnnotationProcessor
    extends AbstractProcessor
{
    SunJavacContext ctx;

    @Override
    public synchronized void init( ProcessingEnvironment env )
    {
        super.init( env );
        ctx = new SunJavacContext( env );
    }

    @Override
    public boolean process( Set<? extends TypeElement> annotations, RoundEnvironment roundEnv )
    {
        if ( !roundEnv.processingOver() )
        {
            for ( Element element : roundEnv.getRootElements() )
            {
                if ( element.getKind() == CLASS )
                {
                    // Cast to compiler internal tree node
                    // NB: this is internal undocumented API that may change with Java7
                    JCTree tree = (JCTree) ctx.trees.getTree( element );
                    TreeTranslator visitor = new FonzieCodeIntroducer( ctx );
                    tree.accept( visitor );
                }
            }
        }
        else
        {
            ctx.note( "Entities intrumented by Fonzie" );
        }
        return false;
    }

}
